divide the following
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Step-by-step explanation:
1. x(x-y)-1(x-y)÷(x-y)=(x-y)(x-1)÷(x-y)=(x-1)
2.( x+y)^2-1^2÷(x+y-1)=(x+y-1)(x+y+1)÷(x+y-1)=(x+y+1)
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